Steam-boiler.



UNITED STATES Patented May 19, 1903.

PATENT OFFICE.

CHARLES "oLSoN, E ,GRAND RAPIDS, MICHIGAN.

SPECIFICATION forming part of Letters Patent N o. 7282'84, dated May 19,1903. Application led September 19, V1902. Serial No.lzlli( A(No model.)

To alla/hom it may concerm. I

Be it known that I, CHARLES OLSON, a citif zen of the United States,residing at Grand Rapids, in the county of Kent and State of Michigan,have invented certain new and useful Improvements in Steam-Boilers; andI do hereby declare the following to be a full,elear, and exactdescription of the invention, such as will enable others skilledin theart to which it appertains to make and use the same. f

My invention relates to'improvements in steam boilers, and moreespecially to improvements inthe style of boilers shown in myapplication, Serial No. 100,041,led March 26, 1902; and the object of mypresent invention is to increase the amount of heating-surface in aboiler of a given size and to provide the same with certain new anduseful features, hereinafter more fully described, and particularlypointed out'in the claims, referen ce beinghad tothe accompanyingdrawings,

in which- Y Figure l is a side elevation of a device embodying myinvention with a portion of the outer shell brokenaway to show theconstrue'v tion; Fig. 2, a vertical section of the same on the line 2 2of Figs. 1 and 3 with the curved tubes omitted; Fig. 3, an inverted planof the lower end of the same, and Fig. 4 a plan of the upper end of thesame.

Like letters refer to like parts in all of the figures.

A represents the outer shell of the boiler, tubular in form and havingdetachable rings B at each end projecting inward and provided with aseries of set-sc rewslG.

J is the packing, arid- Kv the` packing-ring, the device so far beingthe same as shown in my aforesaid application.l

D is an inner tubular shell of sufficiently less diameter than the outershellA to leave a suitable water-space between and provided at each endwith outwardly-projecting anges D', engaging the inner surface oftheshell A and the packing J, thus forming'an annular chamber between the`two shells A and D. This inner shell D isopen at the bottom andprovided with a head H, closing the upper end of both shells, and acrown-sheet G, located a little below the water-line and parallel to thehead H. The space between the headH and crown sheet G constitutes thesteamspace of the boiler, and openingsE are formed in the inner shell Dto permit free circulation of the steam and water between the steamspaceand the annular space between the two shells.V

I represents .any suitable number ofiiues extending vertically throughthe-head H and crown-sheet G.- i

The interior'of the inner shell VD below the crown-sheet constitutes thefire-box and heating-chamber, and within this space are located theinwardly-projecting.curvedy tubes F, inserted in the shell Dandopening'at each end into the space between it and the outer shell A.These tubes are each preferably bent in a regular curve, forming asegment of such length and radius as to engage the side of the innershell at substantially right angles where inserted therein, and they areformed of differentlengths and radii, whereby two or more may bearranged near veach other and concentric and also in the same plane.Each tube is preferably arranged in a horizontal position intheAfire-box, and said4 tubes are also in snperposed planes andin-ascen'ding spirals, thus being laterally presented to the ascendingcurrents of hotgases from' the fire and imparting a spiral motiontheretoto more effectually circulate the same amongth'e tubes andmoreeofectually heat the same.

The device is intended more especially for use in small boiler's,andparticnlarly'in boilers operated byl gasolene or other, liquid fuelburners, and is particularly intendedfor aulorlele/bilahoilers.

e operation will be readily understood from the foregoing descriptionwithout further explanation.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

l. In a steam-boiler, a double shell with a water-space surrounding thefire-box, and tubes bent in arcs of circles andarranged in horizontalplanes within the fire-box; each tube having both rendsopcning .through'the Side of the iire-box and into the water-space.

2. In a steam-boiler, an inner shell forming the wall of the fire-box,an outer shell surrounding the inner shell and detachably connectedthereto, and tubes bent in arcs of circles and arranged in horizontalplanes within the {ire-box each tubehaving both ends inserted in thewall of the fire-box and in the same horizontal plane.

3. In a steam-boiler, a double shell with water-space, and surroundingthe fire-box, tubes bent in arcs of circles and having different lengthsand radii and concentrically arranged inthe same horizontal plane withinthe fire-box each tube also having both of its ends inserted in the wallof the fire-box and opening into the water-space surrounding the theinner shell, a head closing the upper ends of the shell, a crown-sheetat a distance below the head and parallel therewith, ilues connectingthe head and crown-sheet, and tubes inserted in the inner shell andextending horizontally inward therefrom and opening at both ends intothe space between the shells.

6. The combination of an inner and outer shell with space between, acrown-sheet in the inner shell, an upper head closing the outershell,lues extending through the crownsheet and head, and tubes insertedin the inner shell and extending inward therefrom and opening into thespace between the shells at both ends, said tubes also being bent inarcs of circles and arranged in horizontal planes and spirally invertical series.

In testimony whereof I aix my signature in presence of two witnesses.

CHARLES OLSON. Witnesses:

LUTHER V. MoUL'roN, GEORGIANA CHACE.

